根据课本P58 的课本内容回答下列问题。
1.Who like to listen to international radio stations and watch international television ?
___________________
2.Why do students need to know about the world?
_____________________
3.What are students learning to do all over the world?
___________________
4.What's the name of the Professor in the text?
___________________
5.What does "opening a door"mean?
___________________
→
（β衰变） 
→
（α衰变） 
→
（轻核聚变) 
→
（重核裂变）
